Appliance for die-presses or the like.



C. D. M'cDONALD.

APPLIANCE FOR DIE PRESSES 0R THE LIKE.

APPLICATION FILED FEB. 23. |917.

l 925292?? Patentedv Jan. 1, 1918.

3 SHEETS-'SHEET I.

C. D. McDONALD.

APPLIANCE FOR DIE PRESSES 0R THE LIKE.

APPLICATION FILED EEB. 23, |917.

Patented Jan. l, 1918 Mmmm 3 SHEETS-SHEET 2.

v INVENTOR. Charles B M Q Farma/M,

WITNESS t Mgg ATTORNEY C. D. NICDONALD.

APPLIANCE FOR DIE PRESSES 0R THE LIKE.

APPLICATION FILED 3.23. 1917.

L, Patented Jan. 1,1918.

3 SHEETS-SHEET 3- l j' '.1 A TTORNEY CHARLES D. MenoNALD, or CHICAGO, ILLrNoIs APPLIANCE FOR DIE-PRESSES OR THE Specication of Letters Patent.

Patented Jan. i, 1918.

Application led February 23, 1917. Serial No. 150,445.

To all lwhom it may concern:

Be it known that I, CHARLES D. MODON- ALD a citizen of the United States, residing at hicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvements in Appliances for Die- .Presses or the like, of which the following 1s a specification.

The present invention relates to a means for automatically stopping a die-press, or similar machine, in such cases where the normal operation of the die is prevented by reason of a choking of the work in the die members, or through some other cause which interferes with the normal operation.

One object of the invention is to provide a mechanism so arranged as to act to automatically stop the application of power to the working parts of the machine when the die member is for any reason prevented from normal operation.

A further object of the invention is to simultaneously operate both a clutch and a brake mechanism at the periods when the appliance acts to shut off power, whereby the cross-head carrying the die is brought to rest at the topof its up-stroke.

A further obiect of the invention is to provide a member which will be given a shifting movement by the die member when the latter fails to make its normal `move ment, and to amplify this shifting movement in such manner as to cause the operation of the devices which cut olf the supply of power. v

A further object of the invention`is to provide means whereby, when this supply of power is cut olf, the mechanism must be reset by hand before further power can be applied, thereby preventing a sudden and unexpected starting of the machine.

The invention further consists in the features of construction and combination of parts hereinafter described and claimed.

In the drawings:

, Figurel is a side elevation showing the appliance ofthe present invention used in connection with a die-press, and showing the parts in such position as they assume during the normal operation of the die member;

Fig. 2, a. view similar to Fig. 1, but showing the arrangement of the parts when the die, through a choking of the work. or otherwise, meets a resistance and a back pressure is created; and in such arrangement the parts are set to cut olf the application of power from the main drive shaft to the mechanism of the machine, thus stopping further operation of the machine;

Fig. 3, a front View of the parts shown in Figs. 1 and 2; l

Fig. 4, a detail of the shifting member, which receives the initiatory movement from the die when the latter fails to make'its normal stroke;

Fig. 5, a detail of one of the clutch-actuatmg arms;

Fig. 6, a front view of the clutch and clutch-actuating arm;

Fig. 7, a detail of the clutch, partly in section; and

Fig. 8, a side view ofthe clutch.

In the art to which the present invention relates, considerable difficulty has been experienced by reason of the fact that the work at times willjam in the female portionvof the die; and the male portion of the die continuing to operate after such jamming, there will ensue a breakage or other accident to the mechanism, which will necessitate the stopping of the machine while repairs are being made. Owing to the speed at which these machines are run, it is in most cases impossible for the power to be shut of through operation of the usual appliances until after the damage has been done. A

The present invention contemplates the provision of an appliance whereby this power will be automatically shut of at such times as owing to jamming or other conditions arising which prevent the die member from taking its free and usual stroke. By automatically cutting oif the power at such A times and the consequent stoppage of the machine as soon as the cross-head carrying the die reaches its uppermost position, there is eliminated practically all danger of breakage or other accident to themachine occurring by reason of its continuing to run after such jamming.

Referring now to the drawings, the invention is shown in connection with a diepress, which comprises a press body 8, which may be of any usual and well known construction; and mounted to reciprocate in the usual guides or ways is the male die member 9, carried by -a cross-head 9, which cooperates with the usual female member to carry out the cutting operations.

In the construction shown, the die member formed of an arm 10 and an arm 11, the meeting ends of which arms are connected by a pivot pin'12; and attached to this pivot pin is an arm or link 13 which is connected to an eccentric strap 14 actuated from a main drive shaft 15.

It is obvious that as the main drive shaft revolves, the link 13 is reciprocated back and forth, which moves the pivot pin 12 back and forth, causing an in-and-out movement of the arms l0 and 11, and the reciprocation of the die member 9. It is to be noted that the arm 10 is joined to the die member 9 by a pin 16. While the fore` fgoing is a very goodway of operating the die member, it is, of course, contemplated that other means and other methods may be employed for imparting to the die member its reciprocating movement.

Located above the arm 11 is a short link or arm 17 terminating at its upper end in a cup-'shaped portion 18; and the short link 17 is connected to the arm 11 by a pivot pin 19. Joined to the cup-shaped portion 18 of the short link 17 is a pin or stud 20, which extends to the outside of the press and 'has itsend 21 resting against the end of a threaded stem 22, carried by an arm 23, pivoted at 24.

This stud 2O extends through a compressible member 25, of rubber or other suitable material; and this compressible member is held between the cup-shaped portion 18 of the short link 17 and a cap-piece 26 suitably secured in a head 27 carried by the press body. The resistance of the compressible member is suiicient so that it acts to prevent movement of the stud 20 when the press is running normally; and there is required the back pressure due to the die encounteringy an abnormal resistance before the stud can rise against the resistance of the compressible member. The cap-piece 26 is adjustable, and by adjusting the same, the dev This lever is provided with a hand piece 34,

gree of resistance of the compressible member 25 can be varied to suit conditions.

The arm 23 is joined by a pivotal connection 28 to a rod 29, which extends downward and through an opening 30 in an arm 31. Thearm 31 is secured to a lever 33, which is pivotally mounted upon a pin 32.

and adjustable stops 35 and 36 may be ,provided, if desired, to limit its up and down movement.

Connected to the lever 33, by a pivotal connecting member 37, is a link 38, which is pivotally connected at 39 tol a lever 40, pivoted at 41.V Pivotally connected to one end of the lever 40 is a rod 42 connected to an arm 43, the movementsof which arm operate a spreader member 44 for brake sections 45 and 46, which are pivoted together at 47.

To the op osite end of the lever 40 is attached a ro 48 connected to one end of a.

raam

bell-crank lever 49, which is pivoted at 50;

hub 61, which is keyed to the main drivey shaft 15. Arranged to slide through this hub is a clutch-pin 62, which is adapted to enter a recess 63 in a fly-wheel 64, driven from a suitable source of power. The clutchpin is thrown inward by means of a spring 65. The l'pin 62 is formed with anotch 66; and arranged to engage with said notchI are wedge-shaped ends 67 (see Fig. 7), there being one of such wedge-shaped ends on each of the clutch-actuating members 53 and 60.

It is obvious that as these clutch-actuating members are thrownV inward, one of the wedge-shaped endsY will engage with the notch, pulling the clutch-pin 62 outward and breaking the connection between the hub 61 and y-wheel 64; and thus stopping the ma- Chine. v"When the clutch-actuating members 53 and 60 are pulled outward from the hub 61, the spring 65 will force the pin inward, where it will drop into the recess 63 in the {1y-wheel 64 and establish a connection between the fly-wheel and drive shaft. The clutch-pin is engaged bythe wedge-shaped ends at a point whereby the connection will be broken at the time the cross-head carrying the die reaches its uppermost position, thereby stopping the die at the top of its upstroke, and thus placing it in proper position for starting.

lVhile the above-described clutch is deemed to be a practical one, the use of any desirable fornrof clutch is contemplated. A spring-pressed pin 68 is shown for the pur- "pose of assisting to hold the clutch-actuating member 60 inward.

The operation of the doviceis as follows:

Assume that through a choking of the work, or some other impediment, the die meets a resistance on its downward movement, the back pressure or strain dueto such resistance will be transmitted through the arms l() and 11 and to the short arms 17, causing the latter to move upward. This will force upward the stem 20 against t-he pressure of the rubber or other resilient member 25, which will elevate the arm 23, pulling the rod 29 upward, which will act through -the arm 31 to swing the lever 33 downward and into the position shown in Fig. 2.

1,252,2#9 l fa Then, through the instrumentality of the link 38, the lever 40 will be rocked to move its various ends from the position of Fig. 1 to that of Fig. 2. Such movement will push down the end of the lever 40, to which the rod 42 is attached, which will swing the arm 43 and actuate the brake spreader into the position shown in Fig. 2, allowing the brake to press inward^and exert its braking action on the hub 61, which is keyed to the drive shaft. The end of the lever 40, to which the arm 48 is attached, will be forced u ward, lifting the rod 48, rocking the belcrank lever '49, forcing inward the link 51, and similarly forcing inward the clutch-ac" tuating member 53; and' the movement of the portion 55, which is attached to the clutch-actuating member 53, will shift the connecting link 57 from the position of Fig. 1 to that ofFig. 2, which will swing the arm 58 about its pivot 59 tocarry the clutch-actuating member 60 inward and into operative position, this movement being assisted by the pin 68.' These clutch-actuating members when so shifted will actuate the clutch-pin ,so as to check the imparting of movement from the main drive shaft to the operative portions of the machine, which checking, as stated,is at apoint when the die reaches its limit of 11p-stroke. i

After the impediment to the normal operation of the die has been removed, in order to start the mechanism, the lever 33 is shifted by hand from the position shown in Fig. 2 to that shown in Fig. 1, which places the arm 31 back into position where it can be rengaged by the end of the rod 29; and such movement of the lever 33 also moves the link 38y upward, rocking the lever 40 and imparting movement to the rod 42 to actuate the spreader 44 and force open the brake members, also imparting movement to the rod 48, so that through the intervening levers and links, the clutch-actuating portions53 and 60 are thrown out of acting position, which permits the pin to move inward and the machine to continue in its operation.

1t is to be noted that, owing to the system of levers and links employed, a very slight movement on the part o f the stem 20 will be suiicient to impart to the operating portions of the attachment the degree of movement necessary. This is due to the amplification of movement through the above referred to system of links and levers.

It is apparent from the foregoing that vthe device is entirely automatic in its operation, and that whenever the male die member fails to make its normal movement, it will actuate the brake and clutch appliances to stop the further transmission of power to the press, and thus eliminate the danger of breakage from a continued applicatlon of power after the die has become jammed,

or some other condition has arisen which prevents its free, normal movement.

It is also apparent that, owing to the fact that it is necessary to enter into a hand operation before the machine can be started again, the danger of premature starting of the machine is eliminated.

The appliance as a whole is very simple of construction and can be easily employed with any style of die-press, or similar machinery. lt is, of course, understood that I do not confine myself to the features of construction which are herein shown and described, but any departure from them w1th1n the scope of the appended claims is contemplated.

l claim:

l. The combination with movable die mechanism, of power driven means for operating said mechanism, a shiftable member adapted to be actuate-d by abnormal pressure encountered by the die during its movements, a pivoted lever member, a connection between the7 shiftable member and pivoted lever member, clutch mechanism for A controlling the'application of power to said operating means, means for actuating said clutch mechanism, and a connection between said clutch mechanism actuating means and said lever, substantially as described.

2. The combination with movable die mechanism, of power driven means for operating said mechanism, a shiftable member adjacent onevendl of said mechanism and adapted to be actuated when said mechanlsm encounters abnormal pressure during its movements, a pivoted lever member, a connection between the shiftable member and pivoted lever member, clutch mechanism for controlling the application of power to sald operating means,.means for actuating said clutch mechanism, and a connection between said clutch mechanism actuating means and said lever, substantially as described.

3. The combination with p movable die, mechanism, of power driven means for operating said mechanism, a shiftable member adapted to be actuated by abnormal pressure encountered by the die mechanism during its movements, a pivoted lever member, a connection between the shiftable member and pivoted lever member, clutch mechanism, for controlling the application of power to said operating means, means for 'actuating said clutch mechanism, a connection between said clutch mechanism actuating means and said lever, and said lever and connecting means serving to amplify the movement of said shiftable member in transmitting. said movement to the clutch actuating means, substantially as described.

4. The combination with movable die mechanism, of power driven means for operating said mechanism, a shiftablemember adjacent one end of said mechanlsm and adapted to be actuated when said mechanism encounters an abnormal pressure during its movements, a pivoted lever member, a connection between the shiftable member and pivoted lever member, clutch mechanism for controlling the application of power to said operating means, means vfor actuating said Aadjacent the die mechanism and adapted to be actuated by abnormal pressure encountered by the die mechanism during its movements, a pivoted swinging member, a con, nection between the shiftable member and swinging member, a pivoted lever member, a connection between the swinging member and pivoted lever member, clutch mechanism for controlling the application of power to said operating means, clutch actuating means, a connection between the clutch actuating means and lever, said swinging member being arranged when returned to normal position "to -bring the remaining `parts to normal position, and said swinging member being returnable to rnormal position by a manual operation, substantially as de.- scribed.

6. In combination with movable die mechan'ism, power driven means for operating said mechanism, clutch' mechanism for conrasage# connecting the shiftable member and clutch actuating members, and saidlinks and pivoted levers serving to amplify the movement of the sliiftable member in transmitting such movement to the clutch actuating members,

substantially as described.

back pressure created by the die mechanism encountering an abnormal resistance to itsv normal movement at any point in said movement, and means exerting a counter resistanceto prevent actuation oi the said power controllingi actuating means during the nortrolling the application of power to saidl power driven means,.shiftable means for actuating the clutch mechanism, and located adjacent the die mechanism and adapted to be actuated by abnormal pressure encountered by the die mechanism during its movements, members moving in opposite directions for engaging the movable clutch member of said clutch mechanism to move the erating said mechanism,l a shiftable member adjacent the die mechanism and adapted to be actuated by back pressure due to an obstruction to the normal -movement of the die mechanism, clutch mechanism for con- 'trolling the applicationof power to the operating means, members moving in opposite directions for actuating said clutch mechanism, a series of links and pivoted members mal operation of the die mechanism, substantially as described.

9. The' combination with movable die mechanism, of power driven means for operating said mechanism, means operable from abnormal pressure encountered by the die mechanism during its movements, for cutting olf theapplication of power from said operating means, means exerting a resistance to prevent actuation of the power cutting-oli' means during the normal 'operation of the die, and means for adjusting the degree of resistance of said resistance means, substantially as described.

10. The combinationi with al movable die i member, of power driven means-for operating said member, means tor controlling the application of power to said power driven means, and means for actuating said power controlling means, operating automaticalljr to cut oil application of power to the power ico driven means when the die mechanism encounters an abnormal resistance to its normal movement at any point inl said movement, substantially as described.

11. The combination with movable die mechanism, of power driven means for operating said mechanism, mechanism for controlling the application of power to said power driven means, shiftable emergency acting meansv having a. part thereof located adjacent one end of said die mechanism and adapted to be actuated to break the application of power to s aid driven means when said die mechanism meets abnormalv resistance 'to its normal movement, substantiallyT as described. l

v12. The combination with movable die mechanism, of power driven means for operating said mechanism, mechanism for controlling the application of power to said power driven means, shiftable emergency acting means having a part thereof located adjacent the upper end of said die mecha- I nism'iand adapted to be actuated to break thel application of power to said power driven means when said die mechanism meets abnormal resistance to its normal movement, substantially as described.

13. The combination with movable die mechanism, ofpower driven means for operating said mechanism, mechanism for controlling the application of power to said power driven means, shiftable emergency acting means having a part thereof located adjacent said die mechanism and adapted to be actuated to break the application of power to said power driven means when an abnormal resistance' to the movement of the die is encountered, substantially as described.

14. The combination with movable die I mechanism, of power driven means for operating said mechanism, means for controlling the application of power to said power driven means, shiftable emergency acting means, a connection between said emergency acting means and said means for controlling the application of power to the power driven means, said emergency acting means operating when said die mechanism encounters abnormal resistance to its normal movement, and moving said connection to break the application of power to said power driven means, and said connection serving to amplify the' movement of the emergency acting means in transmitting such movement to the means for controlling the application of power, substantially as described.

15. The combination with movable diev mechanism, of power driven means for operating said mechanism, mechanism for controlling the application of power to said power driven means, shiftable emergency acting means having a part thereof located adjacent said die mechanism and adapted to be actuated to break the application of power to said power driven means when an abnormal resistance to the movement of the die is encountered, and means exerting a pressure to prevent movement of the emergency acting means in the absence of said abnormal pressure, substantially as described.

16. The combination with movable die mechanism, of power driven means for operating said mechanism, means for controlling the application of power to said power driven means," shiftable emergency acting means having a portion thereof adjacent said die mechanism, a connection between said emergency acting means and said means for controlling the application of power, said emergency acting means operating when vsaid die mechanism encounters abnormal resistance to its normal movements,

and moving said connection to stop the application of power to said power driven means, and said connecting means serving to amplify the movement of the emergency acting means in transmitting such movement to the means for controlling the application of power, substantially as described.

17. The combination with movable die mechanism, of power driven means for operating said mechanism, means for controlling the application of power to said power driven means, shiftable emergency acting means adapted to be actuated when abnormal pressure is encountered by the die mechanism to its normal movement, and said emergency means when moved acting to cut off the application of power from said power driven means, brake mechanism acting on said power driven means` and means actuated by the movement of said emergency means for actuating said brake mechanism to set the same, substantially as described.

18. The combination with movable die mechanism, of power driven means for operating` said mechanism, means for controlling the application of power to said power driven means, shiftable emergency acting means, a connection between said emergency acting means and said means for controlling the application of power to the power driven means, said emergency acting means operating when said die mechanism encounters abnormal resistance to its normal movement and moving said connection to break the application of power to said power driven means, said connection serving to amplify the movement of the emergency acting means in transmitting such movement to the means for controlling the application of power, brake mechanism acting on said power driven means, and means actuated by the movement of said emergency means for actuating said brake mechanism to set the same, substantially as described.

19. The combination with movable die mechanism, of power driven means for operating said mechanism, means for controlling the application of power to said power driven means, shiftable emergency acting means adapted to be actuated by abnormal resistance to the normal movement of the die mechanism and stop the application of power to said power driven means, and means capable of manual operation for resetting the emergency acting means to normal position, substantially as described.

CHARLES D. MCD ONALD. 

